Preheat oven to 400 degrees.
In a large mixing bowl, combine flour, brown sugar, baking powder, ginger, baking soda, salt and cinnamon.
Stir well to combine.
Cut in butter with a pastry blender until mixture is crumbly and coarse crumbs form; set aside.
In a small mixing bowl, combine molasses, half-and-half and egg yolk.
Whisk until smooth.
Stir molasses mixture into flour mixture, just until moistened.
Turn dough out onto a floured bread board.
Knead dough gently about 8-10 times, working in the flour.
Pat dough into an eight-inch round about 2-inches deep.
Cut dough into 12 wedges.
Separate the wedges and place one-or two-inches apart on a greased baking sheet.
(The scones expand while baking).
Beat egg white in a small bowl with an electric mixer until frothy.
This will take a few minutes.
Brush egg white mixture over top of the scones.
Sprinkle each scone with additional granulated sugar.
Bake at 400° for 12-15 minutes, or until each scone is golden brown.
Allow scones to cool a few minutes in pan before removing to a wire rack.